When I look at robertjermans comment, what I seem him saying is that there shouldn't be a need so ship the amps anywhere to have them fixed. It is not like there is some magic black box inside that needs to be decoded, but rather an amplifier, the function of which is well understood by a competent tech, and even without a circuit diagram or operating specs, with a second working amplifier a good tech should be able to isolate and repair the non-working amplifier.
Given Beirut has 1-2 million people and is a modern major metropolitan area, with major universities, there should be at least dozens of techs who could easily diagnose and make the repairs. It is not as if the OP lives in a town of 50 with no electricity, running water, or techs.
Given Beirut has 1-2 million people and is a modern major metropolitan area, with major universities, there should be at least dozens of techs who could easily diagnose and make the repairs. It is not as if the OP lives in a town of 50 with no electricity, running water, or techs.